Photographic camera.



Paented nec. le, i902.

L. J. R. HULST. PHoToGnAPHlc CAMERA.

Application led June 6, 1901.)

2 Sheets-Sheet l.

(No Model.)

x f f i f A is@ am No. 7|5,803 v Patented Deo. I6r |902.

L. J. R. HULST.

PHOTOGRAPHIE CAMERA.

{Applcation led .Tune 6, 1901.)

(No Model.)

w l 'Sg "nlvwent-oz l UNITED STATES PATENT OFFICE.

'LoDEwYKi R. HoLsr, O E BROOKLYN, NEW YORK, AssIeNOR oE-Two- 'rHIRDs To -LoUIs BORSUM,v OE PLAINEIELn, NEW JERSEY.

PHOTGG'RAPHIQ CAM ERA.

`v SPECIFICATION forming' part of Letters Patent N o. 715,803, dated December 16,` 1902.

Application filed .Tune 6,1901.

Serial No. 63,396. (No model.)`

To all whpm' it may concern: f ABe it known that I, LODEWYK JAN RUTGE HOLST, a subject of the Queen of the Netherlands, (but having declared my intention of becoming a citizen of the United States and 1 having taken out my first naturalization pa- The invention consists in certain features of construction associated with the curtain or f focal-plane'shutter,as is hereinafter described in detail and claimed.

In the accompanying drawings, Figure 1 is a longitudinal vertical section through the rear end of the camera-box; Fig. 2, a transverse section on the line 2 2 of Fig. 1; Fig. 3, a horizontal section showing the uppcrcurtain-roll, partly in plan and partly in horizontal section; Fig. 4, a transverse section on the line 4 4 of Fig. l; Fig. 5, a front or face view, and Fig. a longitudinal section showing a vane or fan to be applied to one of the roll-shafts to retard the motion of the shutter or curtain and prolong the time'of the eX'- posure. Fig. 7 is a plan view showinga metal blank adapted to be bent or folded into shape to constitute a clip that may be applied to the linger-button of one of the roll-shafts and that is adapted to clamp a card or a vane, asl

'by a partition 5, havingthe exposure-opening therein. Mount-ed adjacent the front face of this partition and respectively at its upper and lower sides are the curtain-rollers 6 7, of which the former is usually and preferably the spring-drum tobe equipped with the ordinary thumb-piece 7 for winding it.

8 is the shutter or curtain, composed of two sections X and Y, wound, respectively, on the upper and lower rolls. To provide for adjustment of the width of the slip between the two y sections of the curtain, I have devisedj the following construction In the adjacentedges of the curtain-sections are secured by'hemming, pasting, or`otherwise flat metalstrips.

9 and 9. Applied over the edges of the curtain-sections and embracing these strips, so as to be moved longitudinally thereon, are sliding clamps 10 and 10', which may lie-formed of sheet metal.

an aperture at 11 in one end of the 'strip 9 and is then connected at 112 to thel adjacent end of the strip 9 in the edge. of the curtain-` The similar sliding clamp 10 is l I have found by experience that itjsdesir-l able to support the edges of the curtain or shutter to keep it smooth and prevent it from fluttering when in action. This I accomplish in the following manner: On the front facev of the partition 5, at its sides, (or to the side walls of the camera-13021,) I attach shutterguide's 12, Whose front faces adjacent the shutter or curtain are curved ina vertical plane, and against these curved faces the curtain travels and is supported. The curved.l faces of the guides or supports 12 are of considerable radins, and the radius depends in a measure upon the height of the camera-box or the distance between the two rolls. It is apparent that at times the curtain is wound mostly upon the lower roll, thereby increasing its diameter, and at other times mostly uponthe upper roll, thereby increasing its diameter, and that when the shutter is tripped and the curtain is being unwound from the upper roll and wound upon the lower roll it will be traveling in planes constantly varying'in' angular relation to a vertical plane,

and yet at al1 times its edges will be supportv To the clamp l0 on section' X is attached a cord 11, which passes through ed and guided by contact with the curved Vfaces of the guides 12. It is desirable that i4 era-box. Owing to the variation in diamethe width of the front orl guiding faces of the" guides 12 should be as great as possible, particularly at their central parts, in order that the sides of the curtain may overlap them to a snhci-ent extent to prevent the passage of light to the rear around the edges of the cu rtain. By beveling their inner edges 13 to prevent reduction in the cross-sectional area of the light-cone at its point of contact with the plate-or, in other words, to prevent the guides 12 from reducing the effective area of the eXposure-openingiuthe partition 5-I am enabled to make the curved faces of the guides of correspondingly-greater width. I prefer also, as shown at 13', that they shall be widest at thecenter and decrease in width toward the ends. y

In order that the curtain may with facility be wound upon the upper roll and without havingits spindle and thumb-wheel project objectionally from the side of the box, I havev devised the following construction: Within the roll, which maybe hollow or having cavity 14, Fig. 2, formed in one end, I secure a disk' 15, with a square or angular aperture therein. An operating-spindle 16, shaped at its inner end portion to iit the aperture, slides therein, so that it may be drawn out for convenient manipulation, its outward movement being limited by a crosspin 18, abutting against the inner face of the' cup-shaped disk 19, secured in the side of the camera-box.

In front of the'tcurtain I have shown the usual front-light guards,consisting of a transverse portion 24:, attached to the bottom of the camera, extending between its sidewalls and up in front of the lower roll. From the sides thereof rise vertical side-1ight guards 25 of appropriate width and attached, re-

spectively, to the opposite walls of the camter of the upper roll, as the curtain is wound or unwound thereon these side-light guards,

which are usually madeo'f sheet metal, can'n not be so disposed Aat'their upper ends as to at all times. I therefore provide at theirupper ends iiexible strips orextensions 26,which may be made of any suitable fabric-as velvet, plush, leather, &c.-and which at all times, irrespective of variation of diameter of the upper roll, bear upon it and effectivelyV exclude the lightat all times. So far as I am aware, this is a new feature in cameras of this general class and constitutes an important and'eective improvement thereon.

In the drawings, A represents the side supports for ,the` hinged mirror-frame, (not shown,) and C the transverse support, which parte also act aslight-g'uards.

D is the lever for raising the mirror-frame' and also actuating the latch E to trip .the shutter.

As shown 'at 27, Fig. 3, the button onV the winding-spindle of the upper roll may be notched orslit transversely. By means of this simple expedient may apply or attach to the button an ordinary card of suitable dimensions or a fiat thin piece of celluloid or hard rubber, which when the shutter is tripped acts as a Vane or fan to equalize and retard its speed. By using fans of diiferent area I may thus Within considerable limits control or regulate the period ofexposure. In Figs. 6 and 'Z I have shown a vane or fan consisting of two slotted sections 28 29, clamped together by a set-screw 30, the area of the fan being thus adjustable. Such a device may be insorted in the notch 27, being retained therein frictionally or otherwise. In Figs. 9 and 10 I have shown a clip adapted to clamp upon the button and having closely adjacent or spring jaws 31 to. hold thefan (shown in Fig. 6)' or any card or suitable piece of flat material. The clip is preferably made of sheet metall and bent up from the blank shown in Fig. 8.

I claim as my in'vention-l 1. In a focalplane-shutter photographic camera, the combination of the curtain-rolls, the curtain and the curved vcurtain edge guides. 1

2. In a focal-plane-shutter photographic camera',.-the combination of the curtainrolls, the curtain and the curvedcurtain-edge guides having their inner edges beveled rearwardly and outwardly.

3. In a focal-plane-shutter photographic camera, the combination of the curtainrolis, the curtain and the curved curtain edge guides of greater width at the center than at the ends and having their inner'dfges beveled rearwardly and outwardly;

4. In a focal-planeshutter vphotographie camera, the combination of' the curtain-sections having stiifening-bars inthe edges, a friction-clip embracing each edge andsliding thereon, and a cord extending from each' clip to the corner of its curtain-section and thence to the corresponding corner of the otherjcnrtai n-section.

5. In a focal-plane-shut'ter photographie camera, the combination wit-h the curtain and its rolls, of the bottom andlside-light'guards, and iiexible extensions from the upperends of the side guards'bearing on the 'periphery ot' the upper roll adjacent its'ends.

6. In a focal-planc-shutter photographic camera, the combination with the curtain, of'

the spring-roll, the winding-rolls, the endwislemovable spindle of one of the rolls, and alvane removably attached to the endwise-movable spindle to retard the speed. f

7. In a focal-plane-shutter photographic camera, the -combination-of the curtain, its spring-roll, its winding-roll having a telescoping winding-spindle, and a speed-.controlling vane applied to the spindle.

In'testilnony whereof I have hereunto subscribed my name.

-L. J. R. HULST. Witnesses:

KATHARINE MACMAHON, EDWARD C. DAvrDsoNl IIO' 

